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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Lu Sun Liang Wu Zaichen Zhang Jian Dang Yulong Shen Gefeng Huang Liliang Ding National Mobile Communications Research Laboratory Southeast University Nanjing P.R.China Purple Mountain Laboratory Nanjing P.R.China State Key Laboratory of Smart Grid Protection and Control NARI Group Co. Ltd Nanjing China

ISBN: (纸本)9781665450867

With the rapid development of the smart service industry, indoor high-precision localization technology in the non-line-of-sight (NLOS) environment has attracted great interest. Fingerprint-based indoor localization has been widely employed due to its low hardware cost and high localization accuracy. In this paper, we propose an indoor intelligent localization system based on a 2-dimensional deep convolutional neural network (2D DCNN) and image fingerprints extracted from the channel state information (CSI). Simulation results show that the proposed localization system can achieve a high localization accuracy in the NLOS environment.

关键词： Location awareness Deep learning Wireless communication Simulation Signal processing algorithms Fingerprint recognition Signal processing

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Simulation of Fast Cascading Failures Considering Voltage Ride Through Capability of Renewable Generation

Simulation of Fast Cascading Failures Considering Voltage Ri...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Dongbao Lv Shanshan Qiu Yujun Zhou Changgang Li Junjun Yang Wei Xu Xing Lei Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the rapid development of renewable generation, the evolution process of fast cascading failures in the power system with a high proportion of renewable generation turns out to be more complicated. There are few existing fast cascading failure models that take into account the voltage ride through (VRT) capability of renewable generation. The portrayal of the dynamic characteristics of renewable generation still needs to be improved. In response to this, the VRT control model and VRT protection model have been established to comprehensively depict the output characteristics and disturbance tolerance capability of renewable generation in fast cascading failures. Finally, the simulation results of the AC-DC hybrid receiving-end system with a high proportion of renewable generation show that the established models can effectively depict the influence of VRT capability of renewable generation in fast cascading failures, providing a more comprehensive basis for the analysis of fast cascading failures under the access of a high proportion of renewable generation.

关键词： Renewable energy sources Voltage fluctuations Simulation Power system protection Power system dynamics System integration Delays Power system faults Voltage control Transient analysis

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Analysis of Voltage Violation Based on Extreme Value Theory

Analysis of Voltage Violation Based on Extreme Value Theory

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smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Liwen Sun Han Wu Na Meng Smart Grid Insititute Nanjing Insititute of Technology Nanjing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Nanjing China

In this paper, we present a novel method about voltage violation for distribution networks under high stochastic load penetration. The proposed method combines extreme value theory (EVT) with Cornish Fisher series and semi invariants. In this method, the generalized extreme value (GEV) distribution directly fits the node injection load which avoids the influence of the correlation between various loads, and has the characteristic of small data demand. The efficacy of the proposed approach has been illustrated by an example analysis in the IEEE33 node system.

关键词： Renewable energy sources Stochastic processes Voltage Distribution networks Tail Probability distribution Numerical models

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Research on External Characteristics for PMSG Wind Turbine Systems under Symmetrical Fault

Research on External Characteristics for PMSG Wind Turbine S...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Xie, Hua Zhao, Qingchun Liu, Peilin Gao, Xuesong NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China School of Electrical Engineering Shandong University Jinan China

ISBN: (纸本)9781728191645

Wind turbines (WTs) are based on power electronic converters. Due to different control schemes of converters, WTs exhibit diverse external characteristics when grid symmetrical fault occurs. Thus, the output current and output power of WTs cannot be forecasted, which is a challenge for the power system stability. In this regard, this paper proposes a novel strategy for Permanent Magnetic Synchronous Generator (PMSG) wind turbine systems. The strategy aims to force the PMSG exhibit a stable EFC during grid fault and provide an output current reference to the power system. Besides, the proposed strategy aims at enhancing the low-voltage ride-through capability of the PMSG. The effectiveness and robustness of the proposed strategy is verified in DIgSILENT PowerFactory. © 2020 IEEE.

关键词： Synchronous generators

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A review on the application of grid-forming control in power system

A review on the application of grid-forming control in power...

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Sustainable Power and Energy Conference (iSPEC)

作者： Bo Yao Qinran Hu Xiangjun Quan Wei Li Ling Zhu School of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation/State Grid Electric Power Research Institute School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation/State Grid Electric Power Research Institute

ISBN: (纸本)9781665414401

Due to the continuous improvement of new energy penetration, grid-forming control has become a hot issue in grid-connected technology. grid-forming control simulates the mechanical and electrical transient characteristics of the synchronous unit. The power or load using the converter has the inertia, damping, frequency and voltage adjustment, and other operating characteristics of the synchronous unit machine technology. This paper introduces the development process and basic concept of grid-forming control. It introduces the application of grid-forming control from three aspects of grid connection, frequency modulation, and virtual inertia. This paper focuses on the current problems of grid-forming control, such as control parameter tuning, power oscillation, and parallel grid-forming control circulation. At the same time, the prospect of research direction is put forward given the above problems.

关键词： Damping Frequency modulation Stability criteria Power system stability control systems Voltage control Transient analysis

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Current Compensation-Based Transient Stability Enhancement for an Islanded Microgrid

Current Compensation-Based Transient Stability Enhancement f...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Dept. of Electrical Engineering Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

With the increasing incorporation of renewable energy via power electronic converters, islanded microgrids are susceptible to transient instability when faced with large disturbances, attributed to converters’ low inertia and high nonlinearity. This paper introduces a current compensation-based control strategy to enhance transient stability of an islanded MG. By incorporating frequency deviation between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Compared with previous stability-enhanced method, the proposed strategy demonstrates superior performance in the aspect of small overshoot and fast convergence. Simulation results validate the analysis and effectiveness of this strategy.

关键词： Simulation grid following Microgrids Power system stability Stability analysis Power electronics Transient analysis Frequency control Power generation grid forming

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Transient Stability Analysis and Enhancement of an Islanded Microgrid with grid-forming Converters and grid-following Converters

Transient Stability Analysis and Enhancement of an Islanded ...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Dept. of Electrical Engineering Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

The rising integration of renewable energy through power electronic converters has heightened the susceptibility of islanded microgrids to transient instability under large disturbances, primarily due to the converters’ low inertia and high nonlinearity. For an islanded microgrid with multiple converters, this paper estimates its transient stability based on Takagi-Sugeno method and introduces a phase compensation-based control strategy to enhance its transient stability. By incorporating angle difference between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Simulation results validate the analysis and effectiveness of this strategy.

关键词： grid following Simulation Microgrids Power system stability Stability analysis Power electronics Takagi-Sugeno model Transient analysis Power generation grid forming

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Maximum Capacity Assessment for Multi-paralleled grid-connected Inverters using Global-Admittance based Harmonic Stability Analysis

Maximum Capacity Assessment for Multi-paralleled Grid-connec...

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Sustainable Power and Energy Conference (iSPEC)

作者： Ming Yang Fusuo Liu Yu Wang Wu Cao School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (纸本)9781665414401

With the increasing demand for the renewable energy, the stability of the multi-paralleled grid-connected inverters is the important factor for evaluation the capacity of the inverters connected to power grid. In this paper the maximum capacity assessment for multi-paralleled grid-connected inverters using global-admittance based harmonic stability analysis is proposed. The stability analysis method with global admittance has clear physical concept and is convenient for real-time analysis and calculation. The global admittance method is illustrated first. The inverters are sorted by the capacity. The inverters sequence can be divided into two groups based on the stable critical point obtained by the global admittance method. The group with large capacity is taken as a unit. The stability of the combinations formed by this unit and other inverters in the other group is analyzed further. So the maximum capacity of the grid-connected inverters can be assessed. The application example is used to illustrate and verify the proposed method in this paper.

关键词： Renewable energy sources Systems operation Stability criteria Power system stability Harmonic analysis Inverters Power grids

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Reactive Power Coordination control Based on Vsc to Improve Lcc's Ability to Withstand Commutation Failure

SSRN

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SSRN 2023年

作者： Shu, Hongchun Shao, Zongxue Zhao, Wei State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming650500 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming650500 China

In order to suppress the continuous commutation failure of the line commutated converter (LCC) in the multi-infeed DC transmission system, the ability of the voltage commutated converter (VSC) in the hybrid multi-infeed DC transmission system to provide fast reactive power support is fully utilized, and a dynamic reactive power support coordination control strategy based on LCC current error controller and VSC constant AC voltage control is proposed. When the LCC experiences continuous commutation failure, the compensation amount of the extinction angle is closely related to the DC current error. The compensation amount of the extinction angle can be obtained according to the DC current error during the transient process. The reactive power support required by the LCC is calculated based on the compensated extinction angle, and the required reactive power support is prioritized to be added to the outer loop reactive power control of the VSC inverter side. By constructing a test system for doubly-fed DC transmission with flexible DC in PSCAD/EMTDC, the test results have confirmed the efficacy of the proposed dynamic reactive power coordination control strategy. The strategy has demonstrated a remarkable ability to enhance LCC's ability to suppress continuous commutation failure. © 2023, The Authors. All rights reserved.

关键词： Reactive power

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Research and Application of Simplified Service Bus in New Generation Dispatching Technical Support System and Heterogeneous System

Research and Application of Simplified Service Bus in New Ge...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Yi Qiang Wan Shupeng Wang Zhemin He Weihua Zhang Ping Zhang Feng System R&D Center NARI Group Corporation(State Grid Electric Power Research Institute) NARI Technology Co. Ltd Nanjing China State Grid Shanxi Electric Power Co. Ltd Taiyuan China System R&D Center State Key Laboratory of Smart Grid Protection and Control Nanjing China

With the rapid development of UHV AC / DC hybrid power grid, in order to cope with the large-scale access of new energy, the power market reform has been continuously promoted. Therefore, it is proposed to build a new generation of dispatching technical support system to meet the needs of future power system development and safe, stable and high-quality operation. This paper proposes a simplified service bus that supports a new generation of service-oriented architecture, and meets the deployment characteristics of cloud terminals that are cross platform, lightweight, easy to deploy, open and efficient. The simplified service bus can well meet the location independent characteristics and be easily deployed in and out of the system. The flexible protocol processing mode cooperating with the gateway can meet the needs of accessing the services of the system and external systems. At the same time, it supports multiple man-machine network and automatic switching of service network shutdown under N-1 mode, which greatly improves the availability and stability of the system, Which Provide a strong guarantee for the safe, stable and efficient operation of the new generation system.

关键词： Cloud computing Protocols Switches System integration Power system stability Logic gates Dispatching

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